Today was spent trying to get sponsors.
July 25th, 2016
Lab work: Today we created overnight cultures through inoculation for miniprep tomorrow
- Pipette 5 ml of LB broth into 6 tubes
- Add CM for antibiotic in the Broth
- Have 60 ml of LB broth
- Put 5 ml into culture tube
- Inoculate bacteria grown from last lab day.
- A. Had to do the above procedure again
- A. One tube gets 50 ml → 50 microlitres of CM.
-CM allows only bacterias with CM markers to exist, thus allowing only organisms with the designated sequence to survive and live.
After that, more fundraising work was done.
July 26th, 2016
- Yesterday’s labwork had to be redone since the inoculation wasn’t done correctly.
- Reason: pipette tips used were too short and because the top of the tips were contaminated, the whole culture became contaminated.
- In our redone experiment, we used inoculation stick instead (‘just to play it safe’ Mike reasoned)
July 27th, 2016
- Microcentrifuge 1 ml of culture (do this three times to allow a large amount of cells to build up)
- Addition of 250 microlitres of Buffer-PI allows resuspension of bacteria.
- Add 250 microlitres of Buffer P2. Mix by inverting it 4-6 times.
- Add 350 microlitres of Buffer N3 and mix by inverting 4-6 times.
- Microcentrifuge for 10 minutes at >10 000 rpm.
- Pipette out supernatant from new microcentrifuge into labeled spin columns
- Add 0.75 ml of Buffer PE and centrifuge for 30-60s.
- Add 100 microlitres of Buffer EB after transferring spin column over a new microcentrifuge tube.
- Now, we will test concentration and purity through the use of a spectrophotometer.
- Results:
Miniprep day
Cld+ cultures from yesterday were purple- that’s not good (we want white ones) so we re-inoculated Cld+ for another miniprep tomorrow
Cld- cultures from yesterday were good so we are able to perform miniprep today with the Cld-
- A. These cells should be orange-reddish in colour. The reason for this is due to the production of a ‘heme’ group- that is a protein that binds with Fe.
- A. Buffer PI was spilled on the table, but another bottle was brought down.
- B. To thoroughly mix it, vortex the microcentrifuge column.
- A. Don’t let this sit for more than 5 minutes.
- A. A whitish precipitate should have formed.
- A. Supernatant is what we want. The solid is the garbage.
- B. Once taken out, supernatant will be pipetted out into a separate tube (not a spin column). This allows unison of the supernatant and consistency
- C. *Note* Eppendorf tubes are microcentrifuge tubes
- A. Centrifuge it for 30-60 seconds
- B. Let it sit for a bit
- A. Discard flow-through and centrifuge one more time for 1 minute.
- B. Residual wash buffer (remove it)
- A. Stand for one minute
- B. Spin for one minute
- C. *Technique* Using finger to balance it and place it just above the filtre- Don’t touch the filter.
Vial Number | 260/280 | Concentration in nanograms/microlitre | |
---|---|---|---|
Read 1 | 1 | 1.77 | 88.4 |
Read 2 | 1 | 1.80 | 85.0 |
Read 1 | 2 | 1.81 | 84.4 |
Read 2 | 2 | 1.80 | 85.0 |
Read 1 | 3 | 1.79 | 87.0 |
Read 2 | 3 | 1.81 | 78.6 |
Read 1 | 4 | 1.79 | 83.6 |
Read 2 | 4 | 1.79 | 83.1 |
Read 1 | 5 | 1.79 | 77.7 |
Read 2 | 5 | 1.77 | 81.2 |
Read 1 | 6 | 1.81 | 76.7 |
Read 2 | 6 | 1.79 | 77.2 |
July 28th 2016
- Cld + cultures are ready (not purple this time)
Miniprep (again) today
- A. Perform miniprep on them
- B. We went through the exact procedure as the previous day
Miniprep
- Observations: Like yesterday, the pellet that formed after the microcentrifugation is reddish-orange
- Second centrifugation (with PE) of number 4: the waste was blue and this might be due to the blue dye of the sharpie we used to differentiate vial 4’s content from the rest.
- Results:
- Next, we created a recipe for mixmaster:
- Gel Electrophoresis
- Create master mix by adding 27 microlitres of cutsmart, 171 microlitres of millicule water and 2 microlitres of BsaI. *remember that enzymes are always kept on ice!*
- Transfer fifteen microlitres of master mix into each digestion tube (a total of 13 tubes)
- Add 5 microlitres of DNA to each tube.
- Gel electrophoresis
- Pcitures of results are taken....
- A. Vial 4 (after vortex with Buffer PI) appears to be purplish in colour rather than pink like the rest.
- B. Pink: “Strawberry Milkshake”
- C. Purple: “Glove coloured purple with a slight tint of pink”
- A. At first, it was believed this was due to the initial purple colour, but upon closer inspection, it was realized some blue streaked marks suggested that enthanol cleaned away the blue sharpie dye.
Vial Number | 260/280 | Concentration in nanograms/microlitre | |
---|---|---|---|
Read 1 | 1 | 1.78 | 86.7 |
Read 2 | 1 | 1.83 | 85.4 |
Read 1 | 2 | 1.79 | 98.5 |
Read 2 | 2 | 1.79 | 98.6 |
Read 1 | 3 | 1.83 | 81.9 |
Read 2 | 3 | N/A | N/A |
Read 3 | 3 | 1.82 | 82.9 |
Read 1 | 4 | 1.82 | 97.1 |
Read 2 | 4 | 1.80 | 97.3 |
Read 1 | 5 | 1.82 | 92.7 |
Read 2 | 5 | 1.82 | 93.9 |
Read 1 | 6 | 1.82 | 95.4 |
Read 2 | 6 | 1.82 | 95.4 |
- A. *N/A is due to pipette contamination. The 260/280 value here was 1.64 and the concentration reading was 93.8 nanograms/microlitre
- B. Cld+ may have higher concentrations due to histidines present in the Cld+ sequence.
- A. It was calculated through the formula C1V1=C2V2 that the it was required 26.666… or 27 microlitres of cutsmart. 171 microlitres of milliculewater and 2 microlitres of BsaI.
- A. To check the plasmid backbone and the Cld +/- insert.
- B. Separate (and no gluing)
- A. Each tube is labeled with a digit from 1 to 6 and whether it was Cld - or +.
- A. *note: cutsmart buffer is used to provide optimal environment for cut enzyme.
- B. Cut DNA to compare relative sizes: we will see:
- a. Cld +/- (1 Kb)
- b. Colour gene (0.7 Kb)
- c. Whole plasmid backbone (4 Kb)
- A. Make gel: 1% agarose in TAE into well
- a. *1% is 1g/100ml
- B. Add loading dye into tubes
- C. Add 5 microlitres of sample into wells
- D. Same procedure as practice procedures found online
August 2nd, 2016
- We split the team up into non-science and science groups...
August 3rd, 2016
- Science based
- Perchlorate team initiates
- Biobrick team initiates
- Process and quant bio are to design the experiments and must research up on it. (This requires some time)
- Non science based
- Fundraising work was done
- Biobrick team: tomorrow, they will perform miniprepe after inoculating bacteria replicated today.
- Today, chemical transformation was performed (refer to 8.5) to create a lot of plasmids (there is not enough)
- *When referring, note that ligase was not added
- Plasmid that were used were those given from igem (required in order to win gold).
- Today, inoculation of grown bacteria will be performed to create cultures for miniprep tomorrow.
- Chloramphenicol: antibiotic will be added to the inoculated cultures.
- The given plasmids have a chloramphenicol resistance marker.
- All in all: the purpose of today for the biobrick team: Create more plasmids because there isn’t enough.
- Then. create cultures for miniprep.
- Procedure of the Biobrick team:
- Take out chemically competent e.coli from freezer and put in ice. 50 microlitres of e.coli into microcentrifuge tube.
- DNA are added to cells. Stir with pipette tip, but do not pipette up or down.
- Incubate on ice for 30 minutes.
- Heat shock at 42 degrees celsius for 30 seconds.
- Incubate for 5 minutes on ice, then add 1 ml of LB.
- Incubate for 1 hr at 37 degrees celsius at 250 rpm. (5ml of LB and 5 microlitres of Antibiotic)
- 2 culture tubes: 5 ml of LB, 15 microlitres of antibiotic, and 100 microlitres of plasmid.
- Incubate for whole night.
August 4th, 2016
- Inoculation from yesterday failed
- Therefore, we must do it again
- Two tubes: one of each has: 10 microlitres of plasmid and 5 microlitres of antibiotic
- 10 microlitres of plasmid into 1 microcentrifuge tube
- Incubate on ice for 30 minutes
- Heat shock at 42 degrees celsius for 90 seconds
- Incubate on ice for 5 minutes
- Add 1 ml of LB broth into tube and incubate at 37 degrees celsius for 1 hour.
- Add 5 ml of LB broth into 2 culture tubes
- Add 5 microlitres of antibiotic into each culture tubes
- Transfer 200 microlitres of plasmid and e.coli into each culture tubes (Plasmid is called pSBIC3)
- Shake overnight at 37 degrees celsius.
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